package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;

        //1.获取本次请求的URI
        String requestURI=request.getRequestURI();

        log.info("拦截到请求{}",requestURI);
        //定义不需要拦截的路径
        String[] urls=new String[]{
                "/employee/login","/employee/logout","/backend/**","/front/**",
                "/common/**","/user/sendMsg","/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };

        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.如不需处理，直接放行
        if(check){
//            log.info("本次请求不需处理{}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断登录状态，已登录则直接放行
        if(request.getSession().getAttribute("employee")!=null){

            Long empId=(Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("employee"));


            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断登录状态，已登录则直接放行
        if(request.getSession().getAttribute("user")!=null){

            Long userId=(Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("user"));


            filterChain.doFilter(request,response);
            return;
        }

//        log.info("用户未登录");
        //5.如未登录则返回未登录结果，通过输出流向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match)return true;

        }
        return false;
    }
}
